Patents by Inventor Burkhardt Dreyer

Burkhardt Dreyer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for the direct reduction of iron ores
    Patent number: 3954444
    Abstract: A process for the direct reduction of iron ores using a reducing gas mixture which is passed through a shaft furnace containing the ore to be reduced is disclosed. The process is characterized in that the partial flow of reducing gas mixture is removed from the furnace approximately at the point of transition between the magnetite and Wustite stages of the ore and is regenerated. The regenerated reducing gas is then reapplied to the furnace with a fresh reducing gas mixture resulting in a substantial energy saving.
    Type: Grant
    Filed: February 15, 1974
    Date of Patent: May 4, 1976
    Assignees: Rheinische Braunkohlenwerke AG, Werner Wenzel
    Inventors: Werner Wenzel, Peter Speich, Friedrich H. Franke, Burkhardt Dreyer